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Energy and Protein Intakes by Growing Swine. I. Effects on Rate and Efficiency of Gain and on Nutrient Digestibility¹

University of Minnesota, St. Paul

Abstract

THE addition of fat to rations for growing swine has been demonstrated to improve rate and efficiency of gain (Robison, 1943; Kennington et al., 1958; Sewell et al., 1958; Pond et al., 1960; Clawson et al., 1962; Kuryvial et al., 1962; Lowrey et al., 1962). It is of interest to obtain further information on the effect of added fat on feed and energy intakes and requirements for dietary protein, and to define the effects on nutrient digestibility. Asplund et al. (1960) reported that additions of fat to the ration increased protein digestibility, but C]awson et al. (1962), Kuryvial and Bowland ( 1962 ) and Lowrey et al. (1962) were unable to show similar results. The effect of added fat in increasing digestibility of ether extract appears to be well established (Clawson et al., 1962; Lowrey et al., 1962), but its influence on apparent digestibility of energy by swine is not well defined.

¹ Paper No. 5230, Scientific Journal Series of the Minnesota Agricultural Experiment Station. The data in this publication were taken from a thesis submitted to the Graduate School, University of Minnesota, Minneapolis, by the senior author in partial fulfillment of the requirements for the Ph.D. degree.

² Present address: Almirante Pastene #7, Camilla 2-P, The Rockefeller Foundation, Santiago, Chile, South America.

³ Acknowledgment is due the following for generous supplies of some materials essential to the conduct of these studies: Van Hoven Co., South St. Paul, Minn.; Merck, Sharp and Dohme, Research Laboratories, Rahway, N. J.; and Chas. Pfizer and Co., Inc., Terre Haute, Ind.

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